The Energy Saving Performance Of Heat-Recovery-ventilation System In Residential Buildings In Hot-summer And Cold-winter Zone In China

With the development of economy,the demand for energy in the world has increased correspondingly.The energy consumption in building-related areas is nearly 40%of the total energy consumption in the world,and 50%of it is consumed in the air-conditioning and ventilation systems(HVAC)in buildings.China’s building energy consumption accounts for about 1/3 of the total social energy consumption,and keeps increasing trend.Air-conditioning energy consumption accounts for about 2/3 of building energy consumption.Therefore,how to reduce the cooling and heating energy consumption of air-conditioning system is an important research direction of the green building area.In hot summer and cold winter areas,summer is humid and hot,and winter is cold.Residential buildings need more air-conditioning.At the same time,the good indoor air quality is the guarantee of the health of the residents in our country.The introduction of the new wind to the room is one of the necessary conditions to ensure the indoor air quality.However,the introduction of new wind also brings a lot of air-conditioning load to building.The energy consumption of the traditional air-conditioning system basically accounts for 20%to 40%of the total energy consumption of the building,while the new wind load in the air-conditioning system accounts for 20%to 30%of the total load.The energy consumption of the new wind accounts for 4%to 12%of the total energy consumption of the building.Therefore,there is a contradiction between the improvement of indoor air quality and the reduction of building energy consumption.With the increasing air-conditioning load of residential buildings in hot summer and cold winter area(HSCW),how to use the new type of energy saving technology to reduce the energy consumption of residential buildings has become a very important and urgent problem.It is an effective energy saving measure to set up the heat recovery system to preheat or precool the new wind to reduce the cooling load or heating load of the air-conditioning systerm.Heat recovery ventilation system can meet this demand by lowering the energy demand by pre-heating or pre-cooling.The current research focuses on field measurements of the performance of heat recovery system ventilation in a test building located in east China region To study the actual energy saving performance of the heat recovery ventilation system in HSCW zone in China,actual energy saving efficiency of the heat recovery ventilation system is measured in the test building The experiment reveals that the system can save 14.5%of air-conditioning energy consumption in summer;7.6%of air-conditioning energy consumption in winter;4.96%of air-conditioning energy consumption during rainy season;no significant energy saving effect in transition seasons.Energyplus is used to simulate the energy saving efficiency of the heat recovery ventilation system under operating conditions and compared with the test data.The mathematical model of heat transfer efficiency based on heat and mass transfer theory is introduced.The difference between theoretical value and simulation value of heat transfer efficiency under different climatic conditions is analyzed.The plate-type heat recovery ventilation system w is the key research object,focusing on the whole year air-conditioning energy consumption comparison of residential buildings.This research uses the EnergyPlus numerical simulation software to get the energy saving rate of the monthly heat recovery system in the whole year.This article also discusses the applicability of the heat recovery ventilation system in residential building in the East China District.Then the application of the heat recovery ventilation system is extended to different thermal areas in China,and the energy saving effect of the heat recovery ventilation system in different meteorological conditions is discussed.This has enabled people to enhance their understanding of applicability under various meteorological conditions.